Centrifugal spinning, twisting, and analogous machine



, Oct. 5, 1948. F. WRIGHT v Q 4 2,450,622

CEN'IRIFUGAL srnmme; 'rwzswme, AND ANALOGOUS momma:

Filed Dec. 13, 1946 1 l 11 Sheets-Sheet 1 ;-a'a I I 841 l 2 l I. I ow- I Inventor F. WRIGHT Qct. 5, 1948.

CENTRIFUGAL SPINNING, TWISTING, ANDANALOG OUS .IACHINE Filed D90. 13, 1946 11 Sheets-Sheet 2 nvenlor 6/97;

,wAw/r, W-R

A llorney Oct. 5, 1948. r v F. WRIGHT 2,450,622

CENTRIFUGAL SiINNING, TWISTING, AND ANALOGQUS MACHINE Filed Dad. 13, 194a 1; Shasta-Sheet 4 8/ as a o A Howey 2,450,622 CENTRIFUGAL SPINNING} TWISTING,- AND ANALOGOUS MACHINE Filed Dec. 13} 1946 J F. WRIGHT Oct. 5,1943.

11 Sheets-Sheet 5 4 I ll 6 ..|.\7 I l L 4 7 in 7 5 8 5 6 '5 2 w 5 8 6 9 2 6 L 9 I I Inuenlm mm W WR/G/Vf,

.V M m A ll omey F. WRIGHT @Oct. 5,

2,450,622 CEN'I'RIFUGAL srmnme, TWISTING, AND AnALosous MACHINE I ,1 1 Sheets-Sheet s Filed Dec. 13, 1946 Inventor 616 1 FHA/VA Wk/ 0:.5,194s. F. WiRiGHT 2,450,622

CENTRIFUGAL SPINNING, TWIS'I'ING, AND ANALOGOUS MACHINE Filed Dec. 13, 1946 11 Sheets-Sheet 7 llwenlor new AM mq/a/z'z; B, I

A Home)? 'Filed Dec 13, 1946 I F. WRiGHT 2,450,622

- CENTRIFUGAL SPINNING, TWISTING; AND ANALOGOUS MACHINE lnoenlor FHA M1 1409/66);

.4 llorney 11 Sheets-Sheet 8 F. WRIGHT CENTRIFUGAL SPINNING, TWiSTING, AND ANALOGOUS MACHINE Filed Dec. 13. 1946 X 11 Sheets-Sheet 9 FIG/3,

FIG/5.

I lmienlor I 09/1 N/r nae/6w);

By M 2? A ltorney v F. WRIGHT Oct. 5, 1948.

2,450,622 CENTRIFUGAL srnmnie, 'rwrs wme, AND AnALosous mcnnm' 11 Sheets-Sheet 11 'Filed Dec. 13, 1946 III, III

I v In en or FRA NA w/wewf By Patented Oct. 5, 1 948 UNITED STATES PATENT OFFICE CENTRIFUGAL SPINNING, TWISTING,-AND

ANALOGOUS momma.

Frank Wright, Haworth, England, asslgnor to Prince-Smith & Stella Limited, Keighley, Eng,

land, a British company Application December 13, 194d, Serial No. 716,118 a n In Great BritainDeoember 17, 1945 8 Claims; (01.51-34) This invention relates to spinning, twisting.

and analogous machines for the centrlfugal'spinning, twisting or the like, of yarns, threads, and similar filaments, wherein each yarn or other filament is traversed by'a vertically reciprocating guide within a revolving holder upon the inner surface of which the yarn or other filament is laid centrifugally and from which holder it is subsequently caused automatically to be wrapped.

on to a bobbin or other externally wound package inserted into the holder from below.- and provided with means to engage the yarn or other filament in order to initiate itstransfer to the bobbin; the delivery means being automaticallystopped for that purpose while the holder continues to revolve; provision also being made for a sufilcient length-of yarn or other filament to extend above the bobbin to enable a bobbin when filled to vbedefied without the ment being-subjected to strain.

The invention alsohas reference to a machine wherein above the normal yarn or other file.- ment mass in each holder there is provided a supplementary length of yarn or-other filament destined to be taken up by the bobbin when rewinding and ,to be paid out thereby during dofyam or other filafing, without imposing tension on the yarn or other filament. When the source of power supplied to the machine is electric there is a risk that upon a failure of the power supply the yarn or other filament mass within the holders will collapse, owing to the reduction in the speed of rotation of the holders, and cannot be re-wound by the intended method, with the result that wastage occurs; and the primary object of the invention is to'obviate :such collapse and the consequential disadvantages accruing therefrom; another object being to enable the arrest of the delivery and the initiation of the unwinding of the yarn or other'fi'lament to be'eifected automatically, and a further object being to enable a machine to operatewithout attention from an operator except for the normal dofilng of the'bobbins.

According to the inventionv the delivery means to the yarn holders and the front carriage supporting the bobbins are controlled electro-mechanically in such manner that, in the event of a breakage of the electric power circuit, the front carriage is caused instantlyto rise and insert the bobbins into the yarn holders from which the unwinding of the yarn or other filament spun therein is automaticallyinitiated and is completed before the momentum of the holders becomessufiiciently reduced to caues the collapse z v v v 1 of the contents of the holders, the delivery tothe yarn holders being arrested after the carriage has attained its top position.

Also, according to the invention, means are provided for regulating the speed at which the front carriage is elevated, also for returning the carably in the lowermost position, against the action of a spring motor, and magnetically-operable trip mechanism in circuit with the power supply ,is adapted, on the failure of the current. to effect the release of the front carriage, the rate of ascent of the carriage when released being regulated by friction clutch mechanism associated with the front-c'ariage pinion shaft.

The front carriage may be maintained in the lowermost position by means of one or more spring-urged latch members connected, either individually or collectively, to an angularly movable'vertical rod mounted in bearings on the machine frame and at'the head of which is arranged a trip mechanism including a continuously oscillating wiper arm free on the rod and engageable by a biased lever located below a solenoidor equivalent actuator whereof the core is normally maintained by the power circuit above said biased lever. and is adapted, on the opening of the circuit, to fall into engagement with said biased lever and to operate the trip mech- Bnism. I

In order to cause an emergency ascent of the front carriage, the carriage pinion shaft may be fitted witha strong spring adapted to rotate the shaft immediately-the latch'constraint'on thecarriage is 'released,"'and to control the rate of ascent of the carriage the pinion shatf may carry a friction clutch whereof one member is fast on and the other is free on the shaft, the latter member being driven at a low speed by chain gearing from a suitable part of the machinemotion. Normally, during spinning, these two members of the, clutch maybe held apart by a toggle lever the free end of which engages a stop on I 3 the front carriage which stop, as the carriage ascends, disengages from the clutch lever thus permitting the clutch members to contact at a pressure which is regulated by means of a coil spring, the clutch operating first to retard the ascent of the carriage and subsequently to assist the ascent thereof as the torque exerted by the trically-driven centrifugal spinning machine embodying inverted cup-shaped yarn holders; only so much of the machine per se as is necessary to the understanding oi the present invention being included in the drawings.

Figure 1 is a front view of the control end of a machine, showing three spindle units and their associated parts in the positions occupied during the spinning operation. j

Figure 2 is a detail view, in sectional elevation, of a spring motor employed in the machine, and Figure 3 is a vertical section oi Figure 1 looking towards the end of the machine.

FiguresA and 5 are views similar to Figures 1 and 3, respectively, showing the parts in the unwinding position, and Figure 6 is a detail front view showing the clutch mechanism of Figure 4 in the de-clutched position.

Figures 7 and 8 are end views illustrating the position of certain mechanism, respectively, in the spinning position, and in the unwinding position after having been actuated by the knockof! motion, and Figure 9 is a diagrammatic end view showing the same parts in the unwinding position after operation of the manual control switch.

- Figures 10, 11 .and 12 are detail plan views of part of the mechanism shown in- Figures 7, 8 and 9.

Figures 13, 14 and 15, which. are drawn to a larger scale, are detail views, respectively, in side elevation, plan view, and side elevation, of the trip mechanism which controls the movement oi the front carriage of the machine, the parts in Figures 13 and 14-being in the position occupied by them when the machine is spinning, and in Figure 15 being in the position occupied when the unwinding operation is occurring either after a failure of the power supply or after the power has been intentionally switched off.

Figures 16 and 17 are views, similar to Figures 7 and 8, illustrating the release of the front carriage by an alternate form of knock-off motion.

The machine illustrated in the drawings is of the double-sided type. that is to say, having a bank of spindles at each side; but the invention is equally applicable to a single sided machine, and for simplification of description, those parts which are normally duplicated in a double-sided machine will be referred to hereafter in the singular.

As has been stated above, the general construction of the machine is known and it includes a main frame having end-stands such as I. a fixed top rail 2, a fixed bottom rail 3, and a fixed intermediate rail 4 located a short distance below the top rail 2.

Bolted atintervals to the intermediate rail 4 is a plurality oi bearing brackets or cages 5 in each-oi which a whorl B is mounted in ball bearings and rotatably connected to each whorl 8 is an inverted cylindrical or cup-shaped yarn holder 1 in which the filaments are spun centrifugally in known manner, each whorl 6 being driven as usual by a tape (not shown) encircling it, and a series of statically balanced pulleys such as 8 carried on a spindle 9 extending the whole length of the machine frame and driven in the normal manner.

Above the top rail 2 are located the usual front rollers Ill carried by a shaft Ii supported in appropriate bearings (not shown).

The, front carriage of /the machine comprises the usual vertically reciprocable frame having -at the top an angulerly movable rockshait l2 extending the length of the machine and supported at intervals by guide-posts (not shown) and by vertical rack pillars such as 18 each slidable vertically in guide brackets integral with a casting i5 having a flanged base resting on the bottom rail 3.

To the rockshait ii there are secured a series of spindle or bobbin-peg brackets 18 each supporting abobbin H in axial alignment with each of the aicresaid yarn holders 1, and a handle I8 is pivoted adjacent to the head of the rack pillar It for actuating the railor rockshaft l2 during dofling.

Parallel with and below the rockshait 12, a pinion shaft I9 is supported in bearings on the main frame and has keyed to it pinions, such as 20, corresponding in number to and meshing with rack pillars l3, and an operating handwheel ,2! is keyed to the end of the pinion shaft l9.

Secured tothe rail 4, adjacent in rear of each of the brackets 5 is a tubular guide bracket 22, see Figures 7 and 8, in which, slidable vertically, is a poker 23 operated by the usual traversing mechanism (not shown) and having fitted at its head a forwardly extending bracket 26 upon which rests a traverse rail 25 to which is fixed in rear of each spindle unit a forwardly extending bracket 28 carrying-a tube 21 concentric with and slidable externally of a stationary guide tube (not shown) located within the whorl 8, the tube 21 being slotted rearwardly and fitted at its lower extremity with a traversing thread guide 28 (in a manner already known) for the yarn or other filament T which, after passing over the front roller ii extends downwardly of the tube 21 I through the guide 28 into the yarn holder 1.

The elements described thus far do not, per se, form part of the present invention.

Referring now to Figures 7, 8, 13, 14 and 15.

The rack pillar guide casting i5 .is formed integrally at its upper end with a rearwardly projecting tubular boss 29 in which is slidably mounted a spring-urged plunger-latch 3B whereof the forward end normally enters a recess 30A (see Figures 8 and 17) in the back of the rack pillar t8, and the rearward end of the latch 30 is formed with an eye 31 to which is connected one end of a cord 32 the other end of which is made fast to a pulley 33 keyed on a vertical rod 86 mounted, within the machine frame, in bearings (not shown) so as to be movable angularly.

Near the head of the rod 34 is fixed a radial arm 35 above and parallel with which a bracket 36 is mounted freely on the rod 84 and carries pivotally in its forked free end a trip arm 31 articulated at 38 and formed with an integral depending finger 39.

At its end remote from the pivoted trip arm 31 the bracket 36 is formed integrally with a slotted mam link 40 to which Is articulated at 4I one end of aconnecting ,rod 42-whereof the forward end has securedto it an eccentric strap 43 encircling an-eccentric sheave 44 carried by the front roller shaft H, by which means oscillatory or wiping motion is imparted to the bracket 38 andthe trip arm 31 carried by it.

The trip arm 31 is biased by 'means of a' clutch-operating lever 90 which controls-a ser-i rated clutch mechanism 9I, 82, on the front roller shaft II which can thereby be disconnected from its normal driving mechanism.

weighted extension 45 so as normally to maintain J the depending finger 39 above the plane of thefixed radial arm 35, and remotely from the weighted end 45 the trip arm 81 is formed with a fiat surfaced toe 46 normally presented'(see\ Figure 13) in proximity to and below the lower end of a plunger 41 held out 'of contact with the surface 40 by an electro-magnet 48 in circuit through wiring 49 and switch '50 with the electric control panel 'I of the driving motor (notvshown) of the machine; the panel 5| being provided with a starting push-button 52 and a stopping pushbutton 53.

The control of the rate of ascent of the front carriage is effected by the following mechanism which is shown in Figures 1 to 6 inclusive. The front carriage pinion shaft I9 is encircled at a convenient pointin its length by a powerful spring '54, of the clock-spring type, the inner end of which spring is made fast to the shaft I9 and its outer end'is connected to an anchorage 55 fixed to the bottom rail 3 (see Figure 2), and on the pinion shaft I9 there is mounted a friction cone-clutch whereof the male member 56 is borne by a boss or sleeve 51 freely rotatable on the I02 and a wheel I04 1 carried by a lever shaft I9 and driven at a constant predetermined speed by means of a sprocket wheel 58 fast on vthe sleeve 51 and encircled by a chain 59 passing over a second sprocket wheel 60 (Figures 3 and 5) carried by a motion shaft 6! actuated from the normal driving mechanism of the machine. Thefemale clutch member 62 of the cone-clutch is splined on the pinion shaft I9 and is provided with an integral groove thrust collar 63 engaged by the depending forked end 84 of a cranked clutch-withdrawal lever 65' pivoted at 66 to a bracket (not shown) and extending towards the end-stand I, the free end of this lever b5v being retained, when the front carriage is inthe lowermost or spinning position indicated in Figure 1,

In order to enable the unwinding of the yarn masses from the yarn holders 1 to be initiatedupon a predetermined length of yarn'having been spun thereinto, a knock-off motion of a wellknown type is driven through themedium of a sprocket wheel 93 keyed to the front'roller shaft V M" (Figures 7 and 8) and coupled by a chain '94 to a sprocket wheel 95 keyed on a countershaft 88 which also has-keyed-t'o it a gear wheel 91' meshing with a gear wheel 98 on the upper end. of an obliquely disposed spindle 99 on the lower; end of which is a second gear wheel I00 in mesh with a change wheel IOI keyed on an arbor. I02

and driving the knock-off motion proper. This motion consists of a wheel I03 keyed on the arbor journalled on a pintle I05 its upper end and is provided at its lower end with a thimble or fair-lead I08 embracing thewith one at each side of the machine, if double sided, for a purposementioned. hereafter, consisting of a'handlever n2 pivoted at II3Jand" apertured or forked at its lower end for the hassage therethrough of the cord and abutment stop I I4 lower end of the lever H2.

The primary function of v matically to control the front carriage in the folis fixed adjacent the lowing manner:

by a lug 61 formed at the upper end of the adjacent rack pillar I3, in which position the clutch-P withdrawal lever 64, 65, holds the splined-female clutch member 62 out of engagement with the clutch member 56 and against a compression spring 68 confined between the thrust collar 63 and anannular abutment. 69 fixed on the shaft I9.

At its end remote from the clutch member 58 the boss or sleeve 51 is formed integrally with a cam 10 and encircling the sleeve-51 there is a hoop II suspended pivotally at" from the clutch-withdrawal lever 65 and, during the spinning operation, held out of the plane of rotation of the cam 10 by the nose13 of a trip lever pivoted at I4 on the casting I5 and having a tail 15 adapted to be contacted by a lug 16 carried near the foot of the rack pillar I3.

The bobbin rockshaft I2 carries an .apertured boss 11 fitting slidably over a vertical push-rod I8 slidable'in bearing brackets (not shown) and having a collar 19 fixed to it at a determined height, the upper extremity-of the push-rod 18' being articulated at 80. to a lever 8| carried by an arbor 82 mounted in a bearing bracket 83 secured on the end-stand Land on the arbor. 82

a second lever. 84 is keyed and has articulated and the plunger .41 is bein the arm that shown in Figure 15, thus causing the depend- 7 Durin the centrifugal spinning of the yarn or other filament in theyam holders 1, the front carriage assembly is 'intthe position shown in I Figures 1 and 7, the radial arm 36 is receiving continuous oscillatory movement of small amplitude from the eccentric 44 on the front roller shaft I I maintained in an elevated position-clear of the trip arm 31- by the electromagnet 48 which is energised while the power current is flowing normally.- J

In the event of a failure releasing the plunger 41 which dropssurface 46 of the trip arm 31 and overbalances from the position shown in Figure "13 to 6 ing finger 39 to be presented into theplane of the radial arm 35 and .to impart to it the oscillatory movement of the bracket 38, theeil'ect of which is to transmit angular movement to the vertical rod 34 and the pulley 33 keyed on it, in a direc tion to exert a pull on the cord 32, whereby the plunger-latch 30 is withdrawn from the recess in the rack pillar I3. I

When this withdrawal of the plunger-latch 30 occurs, the clock spring54 immediately rotates the pinionshaft I9 and the front carriage is elevated by the normal mechanism, raising the bobbins II into the yarn holders 1 to initiate the un- I I08 which is pivoted at I01 at,

III, which mesh to predetermined time,

32 on -which a sec- 1 the invention is autoof the power supply the. electromagnet 48 is immediately de energised, on the fiat v to the rising of the front carriage,

winding on to the bobbins of the yarn in the holders.

Simultaneously with in: .1 from the clutch-withdrawal lever the clutch thrust-spring 68 causes the forked end It lever II to force the splined female clutch member it into contact with the coned clutch memher It, the ensagement of the clutch members 58 and II serving in the first instance to retard the the disengagement of the 88, due

access:

of the initial rate of ascent of the front carriage and subsequently supplementing the diminishing torque exerted by the sprin 54,

Towards the end of the upward movement 01 the front carriage the boss 11 contacts with the collar 18 andthereby causes the push-rod It to be raised and. through arms BI, 84, and connecting rod 88. arm ll, and clutch-operating lever 80, the clutch members Bl' and 82 are declutched and the front roller-shaft II and rollers l0 are arrested in readiness for the unwinding operation.

when the front carriage attains its highest position, as in Figure 4. the lug l8 at'the foot of the reel: pillar l3 contacts the tall of the pivoted trip lever, releasing the nose 13 thereof from contact with th'e'pivoted hoop H which thereupon swings into alignment circumferentially of the cam 10 and, by contact with the inner surface of the loop II, the cam causes the clutchwithdrawal lever BI, 84, to disengage the clutch member 82 from the clutch member 55, the lever being held by an, auxiliary catch MA on the rack pillar guide casting ll (see Figure 6).

This automatic de-clutching of the pinion shaft i9 immediately the highest point in the ascent of the front carriage is reached, eliminates unnecessary friction which might retard the rotation of the yarn holders 1 and might prevent their retating for a sufficient length of time to enable the spun material to be unwound before any collapse thereof can occur by reason of the reduction of the speed of the'yarn holders 1.

In Figure 7 an annulus of spun yarn is depicted by broken lines within the yarn holder 1, and in Figure 8 the same annulus is depicted partly unwound on to the bobbin ii, and when the unwinding operation has been completed the front carriage is wound baclcto its lowermost position by means of the handwheel 2], the rotation of the pinion shaft reloading the spring M, and the lowering of the carriage releasing the auxiliary catch 65A from the clutch-withdrawal lever 88 and re-engaging the lug 81 with the lever 65. Normal unwinding, as distinct from emergency unwinding due to power failure, can be initiated whenever required by manipulation of the switch ill to break the circuit to the electromagnet 48. When it is desired to enable the unwinding from the yarn holders 1 to be initiated upon a predetermined length of yarn having been spun thereinto, the knock-oil motion I03, 104, HO, Iii. is set or adjusted appropriately, and when the required length of yarn has been spun the plunger 80 is withdrawn from the rack pillar it by the gularmovementat the required periods to the pivoted depending arm H5, resulting in the breaking of the circuitthrough the trip switch ii! and the electromagnet l8, whereupon the plunger 4T fails and actuates the trip mechanism- 48, I1, 38, 83, and the vertical spindle 34 in the manner already described and causes the plunger 80 to be withdrawn from the rack pillar II andthe front carriage to be released.

The inventionis not limited to any particular type of knock-off motion nor selective gearing,

nor whether mechanically or electrically operated. for the purpose of stopping the machine if and when required, and a timing mechanism (not shown) of any appropriate variety may be incorporated which is put into operation by the elevation of the front carriage into the unwinding position, designed to regulate the time between the initiating of the unwinding and the stopping of the machine, whereby the machine is capable of being left unattended and, at a speciiled time, automatically to effect the unwinding operation and then to stop the machine. The

thimble I08 on the pivoted lever I06 being caused arrangement is such that the timing mechanism can be disconnected, or the mechanism for stopping the machine after unwinding has been completed thrown out-of-gear, since it is not required between normal doillng operations when operatives are in attendance.

. In the case of a double-sided spinning frame. either a single electro-magnet 48 and plunger :81 can be employed to control both sides of the machine, the connections being such that unwinding is initiated on both sides of the machine simultaneously, or, should it be desired to enable unwinding on one side of the machine to take place while the other side is spinning, a separate electro-magnet and plunger and duplicate starting and stopping switches can be fitted thereon. Or to enable unwinding on one side only of the machine to be effected, without using the trip mechanism, a, pivoted handlever H2 connected operatively to the plunger-latch cord 32 as shown in Figures 7 and 8 may belemployed on both sides of the machine.

This latter arrangement enables different counts to 'be spun on the two sides of the machine without difilculty and is simpler than duplicating the electro-magnetic mechanism.

It isto be understood that in practice modifications in design and operation may be made, to suit the handling of filaments of a particular .nature or possessing special characteristics, without departing from the spirit of the invention.

By means of the above described invention. the collapse of the spun yarn within the yarn holders if a power failure occurs, is prevented, the initiation of the unwinding operation is effected automatically, and the machine is enabled to operate without the attention of an operator save for the normal doflng of the bobbins.

I claim:

1-. An electrically driven centrifugal spinning.

8 wherein the arbor isle of the'wheel lilomeans togdeliver yarn to a series of rotaryyarn holders, vertical-1y reciprocable front carriage, an actua ing shaft for said front carriage, a series of bobbins supported by said front carriage to receive yarn'from said yarn holders, electromechanical control mechanism in circuit with an electric power supply, said control mechanism bobbins to be inserted into said yarn holders whereby the unwinding of the filament spun therein is automatically initiated.

2. An electrically-driven centrifugal-spinning,"

twisting or analogous machine,.including deliv- 10 1 trip mechanism being common to said'yarn delivery rollers and said front carriage and being operable in the event of a breakage of the electric power circuit, means positively retaining said front carriage. in its lowermost position, said retaining meansbeing releasable-by said trip mechanism, a'spring'motor connected to said actuat ing shaft to actuate said rack and pinion elevating gear when said carriage is released from said retaining means, speed regulating friction clutch mechanism connected to said actuating shaft to control the rate of ascent of the frontcarriage, and abutments on'said front carriage automat ically effecting-the operation of said speed regu-' lating friction clutch mechanism.

5. An electrically-driven centrifugal spinning, twisting or analogous machine, including delivery rollers to deliver yarn to a series of rotary Wm ery means to deliver yarn to a series of rotary,

yam holders, a vertically reciprocable front carriage, an actuating shaft for said front carriage,

a series of bobbins supported by said front carriage to receive yarn from' said yarn holders, electro-mechanical control mechanism in circuit with an electric power supply, said control mechanism being common to said yarn delivery means and said front carriage and being operable in the event of a breakage of the electric power circuit, retaining means normally holding said holders, a vertically reciprocable front carriage. an actuating shaft forsaid front carriage, rackand pinion elevating gear associated with said actuating shaft, a series of bobbins supported by said front carriage to receive yarn from said yarn holders, electro-mechanical trip mechanism in front carriage in its lowermost position, said retaining means being releasable by said control mechanism, a motor connected to said actuating shaft to elevate said front carriage when released from said retaining means to cause the bobbins to be inserted into said yarn holders and the un-' winding of the filament spun therein to be automatically initiated, and speed regulating mechanism connected to said actuating shaft to control the rate of ascent of the front carriage.

3. An electrically-driven centrifugal spinning, twisting or analogous machine, including delivery rollers to deliver yarn to a series of rotary yarn holders, a vertically reciprocable 'front carriage, an actuating shaft for said front carriage, rack and pinion elevating gear associated with said actuating shaft, a series of bobbins supported by said front carriageto receive yarn from said yarn holders, electro-mechanical trip mechanism in circuit with an electric power supply, said trip mechanism being common to said yarn delivery'- rollers and said front carriage and being operable in theevent of a breakage of the electric power circuit, means positively retaining said front carriage in its lowermost position, said re-, taining means being releasable by said trip mechanism, a spring motor connected to said actuating shaft to actuate said rack and pinion eleyating gear when 'said carriage is released from said retaining means, and speed regulating friction clutch mechanism connected to said actuating shaft to control the front carriage. I

4. An electrically-driven centrifugal spinning, twisting of analogous machine, including delivery rollers to deliver yarn to a series of rotary yarn holders, a vertically reciprocable front carriage, an actuating shaft for said front -car-,

riage, rack and pinion elevating gear associated with said actuating shaft, a series of bobbins supported by said carriage to receive yarn from said yarn holders, electro-mechanical trip mechanism in circuit with an electric power supply, said the rate of ascent of circuit with an electric power supply, said trip mechanism being common to said yarn delivery rollers and said front carriage and being operable in the event of a breakage of the electric power circuit, means positively retaining said front carriage in its lowermost position, said retaining means beingreleasable by said trip mechanism, a spring motor connected to said actuating shaft to actuate said rack and pinion elevatin ear when said carriage is released from said retaining means, speed regulating friction clutch mechanism connected to said actuatingshaft'to control the-rate of 'ascent of the front carriage,

' abutments on'said front carriage automatically yarn delivery means during the ascent of the v 'by said front carriage to receive spun yarn from effecting the operation ofsaid speed regulating friction clutch mechanism, and connections actuated by the ascent of the front carriage for the purpose of disconnecting the drive of the front carriage.

6. An electrically-driven centrifugal spinning, twisting or analogous machine, including delivery means to deliver yarn to a series of inverted cup-shaped rotary yarn holders, a vertically reciprocable front carriage, an actuating shaft'for said front carriage, a series of bobbins supported said yarn holders, electro-mechanical control mechanism in circuit with an electric power supply, said control mechanism being common to said yarn delivery means and said front carriage and being operable in the event of a breakage of the electric power circuit, retaining means normally holding said front carriage in its lowermost position, said retaining means being releasable by said control mechanism, a 'motor' connected to said actuating shaft to elevate said front carriage when released from said retaining means to cause the bobbins to be inserted into said yarn holders and the unwinding of the filament spun therein to be automatically initiated, speed regulating mechanism connected to said actuating shaft to control the rate of ascent of the front carriage, and a knock-off motion connected operatively to said retaining means and serving to cause the release of the-front carriage upon the completion of the spinning operation. I

7. An electricallyedriven centrifugal spinning, twisting or analogous machine, including in combination, a series of yarn delivery rollers mounted wating gear for said the power circuit, clutch mechanism latch member to .11 7 on a driving shalt, a series oi-rotary inverted cup-shaped yarn holders, a vertically-reciproeable front cerriage'supperting. a series oi empty,

with said rack and pinion gearing to control the rated ascent of said carriage, the carriage havin: abutments automatically eilecting the operation of said clutch mechanism, connections actuated by the ascent or the front carriage serving to disconnect the drive of theyarn delivery rollers during the ascent of the carriage, and a knock-oi! motion connected operatively with said cause the release of the iront carriage upon the completion oi the spinning oi the yarn within the yarn holders; the ascent of associated the trout carriage causing the bobbins to'be insorted in the rotating holders from which the unwinding oi the yarn spun therein is automatically initiated and is completed beiorethe momentum of the holders becomes sumciently reduced to cause the collapse of the contents of the yarn holders.

8. An electrically-driven centrifugal spinning. twisting or analogous machine, as claimed in claim 1 and having a row or spindle units on both sides of the machine. provided with a manual lever control of the bobbin carriers in order to enable unwinding to be initiated on one side only oi the machine while the spinning or twisting continues .at the other side.

FRANK WRIGHT.

emotions crrno Theiollowing references are of record in the tile 0! this patent:

UNITED STATES PATENIS Number Name Date 874,682 De Vito Dec. 24, 1907 1,800,830 Gordon, Jr. Apr. 14, 1931 3,142,760 Prlnce smith Jan. 3, 1939 

